Learner's definition of NOR
1 — used after neither to show something is also not true, possible, allowed, etc.
◊ When neither and nor are used to join two subjects, the verb should agree with the subject that is closer to it.
It's neither good nor bad.
I neither know nor care what they think.
Neither you nor I nor anyone else will tell him.
His problems are neither my business nor yours.
— see also neither here nor there at 1here
2 — used after a negative statement to introduce a related negative word or statement
She's not the best student in her class, (but) nor is she the worst.
He didn't quit his job, nor was he fired.
He is not going to the meeting (and) nor am I.
(formal) “I don't know her.” “Nor do I.” [=neither do I; I don't know her either]